72 THE AUSTRALIAN NATURALIST. 
Plate II. 
Mierosocopic sections and views of parts of female “leaf.” 
Fig. 1. Section of “leaf” (low power). a. Cortex. b. Medulla. 
c. Conceptacle. d. Rudimentary “mid-rib.” 
Fig. 2. Same seen with high power. 1. Cortex. 2. Medulla. 
3. Mid-rib. 
Fig. 3. Cross section of conceptacle (low power). a. Ostiole. 
b. Oogonium. ec. Paraphyses. 
Fig. 4. View of young oogonium with paraphyses. a. Outer 
shell of oogonium. b. Paraphyses. ¢. Young oogonium 
with egg cell. 
Fig. 5. Paraphyses (high power). 
Fig. 6. Oogonium (high power). 
PSEUDO FULGURITES. 
By Tuistue Harris. 
The specimens exhibited (at September meeting) were col- 
lected on the side of a sand dune at Deewhy where they occur 
in abundance. True fulgurites were exhibited before the Society 
last year by Miss Heather Drummond (Aust. Nat. V. p. 30) 
these. being formed through lightning striking the sand and 
forming a fused siliceous tube. 
The pseudo fulgurites have an entirely different origin, be- 
ing formed by accretion of calcareous grains round the roots of 
plants. The roots of plants evolve carbon dioxide, which in 
the presence of water partially dissolves the carbonate of lime 
of shell fragments present, and causes these to adhere together 
round the roots, thus forming rough tube-like structures, which 
remain after the decay of-the roots. These calcareous tubes are 
frequently of irregular shapes following the erratic course of 
the roots. 
FOSSILS IN THE NARRABEEN SHALE. 
By Tustin Harris. 
Practically all the shale along the coast at Narrabeen is 
packed full of plant, and possibly insect, remains. Many of 
these fossils are imperfect and difficult of identification, while 
